                    pop
                    (conj 31)
                    (conj 32)))))
-  
+
   (let [stack1 (pop (vec (range 97)))
         stack2 (pop stack1)]
     (assert (= 95 (peek stack1)))

  (assert (not (= 1 1 2)))
  (assert (not (= 1 1 2 1)))
  (assert (not (= 1 1 1 2)))
  
  ;; arithmetic
  (assert (= (+) 0))
  (assert (= (apply + []) 0))

  (assert (= 2 ('b '{:a 1 b 2})))
  (assert (= 2 ({:a 1 :b 2} :b)))
  (assert (= 2 ({1 1 2 2} 2)))
  (assert (= 2 (:a {:b 1} 2)))
  (assert (= 2 (:a {} 2)))
  (assert (= 2 ({:b 1} :a 2)))
  (assert (= 2 ({} :a 2)))
  (assert (= nil (:a {})))
  (assert (= 2 (#{1 2 3} 2)))

  (assert (= 1 (apply :a '[{:a 1 a 2}])))
